Pipe-cutter



(No Model.)

H. GOMSTOGK. 'PIPE GUTTER.

No. 426,171. Patented Apr. 22, Y1890.

UNiTn STATES PATENT OFFICE.

HARRY COMSTOOK, OF FULTON, NE'W YORK.

PIPE-CUTTER.

SPECIFICATION forming part of Letters Patent No, 426,171, dated April 22, 1890.

Application filed December 19, 1890. Serial No. 384,270. (No modeL To all whom it may concern: Y

Be it known that I, HARRY 'Coiisrocie a citizen of the United States, residing at Ful-A ton, in the county of Oswego and State of New York, have invented new and useful Improvements in Pipeutters, of which the following isa specification.

My invention relates to certain improvements in pipecutters for euttin metallic pipes, and the purpose thereof is to provide novel means by which a pipe is channeled to guide the cutters and the burr raised by the cutters is wholly ren'ioved,leaving the end of the pipe perfectly smooth, with a uniform surface and diameter and a beveled edge. It is my purpose, also, to provide a tool of this character in which the fixed jaw shall have a guiding edge or rib coinciding with the path of the cutting-disks, the latter being pivoted in or upon the sliding head which moves upon the cutterstock.

The invention consists in the novel features of construction and new combinations of parts which are fully described hereinafter, and then more definitely pointed out in the claims followin g this specification.

To enable others skilled in the art to make and useiny said invention, I will now describe the same fully and in detail, reference being had to the accompanying drawings, in which- Figure I is a perspective view of a pipecutter` in which my invention is embodied. Fig. 2 is a detail perspective of the fixed reducing and burnishing block provided with a guiding rib or edge. Fig. 5:3 is a vertical section of the sliding head. with the pivotally-attached cutters mounted thereon. Fig. it is a diagram showing the action of the cutters and the reducingblocl; upon a tube or pipe. Figs. and (i are similar views showing the action upon pipes of different forms of cutters heretofore used.

In the said drawings, the reference-numeral l denotes the cutter-stock, consist-ingof a strong rectangular metallic bar having one extremity curved to form a fixed jaw 2, which supports the pipe. Upon the straight porm tion of the stock. is mounted the sliding head 3,whi'cli is provided with a rectangular openfingI to receive the stock. Its adjustment is effected by means of a Screw 4t, having a thread of low pitch, said screwbeing tapped through a lug 5 on the stock.

lVithin the curve of the fixed jaw I mount a reducing and bu rnishin g block G, segmental in shape and having a guiding edge or rib 7 rising from its een trai longitudinal line and eoextensive with the block. Upon each side of this edge or rib I may and prefer to form teeth 8, which may be either transverse coi'- rugations or inclined with reference to the rib 7, or they may consist of teethsimilar to those employed upon a iile. This block 6 is formed of steel properly hardened, and is inserted in a recess in the curved end 2 of the stock.

The cutting-disks 9 are of the usual form, their edges being' turned or ground to give the required shape. These cutters are two in number, and they are journaled in the bifurcated extremities of the U-shaped segmental plate or carrier l O, which is centrally pivoted between its ends upon a pin 12, inserted in a forked angle I3 of the sliding head.

The operation of the tool is evident. The pipe being placed in the fixed jaw and resting upon the block, the screwc is turned until the cutters are brought up to the pipe. The tool is then revolved or drawn around the pipe, the rib or edge 7 cutting a guidingchannel in which the cutterdisks travel. The pipe now lies fiat upon the concave face of the reducing-block, and as it turns thereon the burr which is thrown up by the cutters is immediately removed, the teeth S not only reducin the burr, but burnishing the sui'facc of the pipe, leaving it of substantially the uniform shape and diameter shown in Fig. 3, with the edge beveled at an angle corresponding with the angle of the cuttingdisks.

I may omit the teeth 8 upon the block entirely, in which case its flat surfaces will act upon each side of the central rib as a swage, reducing the burr and preserving a smooth and unit'orin cylindrical surface.

My improved tool is particularly useful in cuttiii what is known as irregular pipiug that is, pipes which are not uniformly circular in crossfsection, but are in a measure oval or elliptical er otherwise irregular as regards a true circle in cross-seetion. In cutting such piping a rigidcutter breaks through, because the cutter in operating on an irregular curve IOO jumps from one high point to another; but with my improved segmental plate or frame pivoted to rock and carrying a pair of rotary cutters the objection mentioned is entirely avoided, for the rocking centrally-pivoted segmental frame causes the cutters to follow every irregularity of pipe-surface, and while one rotary cutter is at a high point of the piping the other rotary cutter is or maybe at a low point of the same. As the pressure from the adjusting-screw is equally distributed on the two cutters by reason of the rocking frame Whatever its position, the two cutters are made co-ordinate or equilibrated in action, thereby equally cutting the high and low places of the pipe at the same instant, or, in or other words, cutting as much in the low place as in the high place.

In my improved tool the reducing and burnishing block is a rigid or immovable fixture during the pipe-cutting operation, and I have found that such rigid and immovable burnishing-block removes the burr effectually to produce-a ne smooth end, and is superior to a revolving vburr-removing-wheel carried by an adjustable slide, for I have found in practice that a rotating burnisher, by constantly rolling over the pipe, forms a scale and another or -second burr. The rigid and immovable burnishing-block constructed and arranged according to my invention burnishes the two endvsurfaces of the piping perfectly smooth and bright and entirely avoids the formation of another burr. The burr formed by cutting a pipe is a solid bank or spun-up part of the metal, and to perfectly remove it and burnish the pipe end surfaces great friction is essential. Aroller burnisher is inefficient, forit flattens the burr and forms another burr, whereas my burnisher, being rigid and immovable in operation, cuts and rubs the ends of the pipe down to the desired form, while the rib follows as a guide in the groove made by the cutters in the initial turn of the tool around the pipe.

Vhat I claim is` l. In a pipe-cutter, the combination, with a stock having a fixed jawand a sliding head carrying cutting-disks, of a curved reducing and burnishing block fixed stationary in the fixed jaw and having a central curved channel-cutting rib, and a curved burr-removing face at each side of the rib, whereby a channel for guiding the cutting-disks is cut in the pipe and the burr raised by the disks is removed, substantially as described.

2. In a pipe-cutter, the combination, With a stock having a fixed jaw and a sliding head carrying cutting-disks, of a segmental reducing and burnishing block fixed in a stationary position in the fixed jaw and having a central segmental channel-cutting rib'and a segmental burr-removing face at eachside of the rib, substantially as described.

3. In a pipe-cutter, the combination, with a stock having a fixed jaw and asliding head carrying cutting-disks, of a reducing and burnishing block fixed stationary in the fixed jaw and having a central segmental channelcutting rib and a segmental burr-removing toothed face at each side of the rib, substantially as described.

4. In a pipe-cutter, the combination, with a stock having a fixed jaw and a sliding head thereon, of a segmental rocking plate pivoted centrally between its ends to the head and carrying at each extremity a rotating cutting-disk, and a reducing and burnishing block fixed in a stationary position on the fixed jaw and having a central longitudinal channel-cutting rib and a dat burr-removing face at each side of the rib, substantially as described.

In testimony whereof I have affixed my si gnature in presence of two witnesses.

A HARRY COMSTOCK. Vitnesses:

N. N. STRANAHAN, CLARENCE TEN EYGK. 

